Sustainable Adhesive Coating for Textile Interlining

The adhesive composition uses a composite system combining bio-based polyelectrolyte complex (from castor oil-derived polyamides) with chemically modified starch. This composite approach allows the renewable materials to work synergistically, achieving both sustainability and reliable adhesion performance that neither material could achieve alone.

The patent modifies the chemical structure of starch through chemical modification to enhance its adhesive properties. Additionally, the polyelectrolyte complex composition is carefully controlled with specific ratios of cationic and anionic polymers to optimize adhesion performance while maintaining high renewable content.

The patent uses chemically modified starch, which is a cost-effective renewable material, as a key component. This approach replaces expensive bio-based polymers with a more economical renewable alternative while maintaining performance through proper formulation and modification.

By optimizing the composition ratios and using chemical modification of starch, the patent achieves cost-effectiveness. The careful selection of polyelectrolyte complex composition and starch modification level allows production at competitive costs while maintaining high renewable content.

The adhesive is applied in a double dot format with two distinct layers: a lower dot that provides initial bonding and an upper dot that enhances adhesion. This segmentation allows each layer to be optimized for its specific function, achieving superior overall adhesion performance.

Within each dot layer, the adhesive composition is kept homogeneous to ensure consistent performance. The lower dot uses a specific polyelectrolyte-starch ratio optimized for substrate bonding, while the upper dot uses a different ratio optimized for fabric adhesion, but each layer itself is uniform.